This lab's maddening silence is good for business but bad for sanity.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

Monasteries on rock pillars, once accessible only by frayed ropes.

A trash dump made beautiful by nature's power.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

The oldest garden in Prague, once part of an medieval orchard.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A snapshot of the city's fascinating voodoo culture.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

The ghostly remains of an accidental sea.

Thousands of well-dressed mummies below a monastery.

A hand-built folk art installation covered with messages of God's love.

A seemingly endless landscape of pure salt stretches far across Bolivia.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

Dramatic river bend surrounds a natural red-rocked pedestal.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

A 16th-century horror show built in a lovely Italian garden.

The fairy tale castle of the "fairy-tale king."

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

A swing to dangle you off the very edge.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

A bizarre house filled with an astounding array of collections.